grepl for a period “.” in R?

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See the differences with these examples

 > grepl("\\.", "Hello.")
[1] TRUE
> grepl("\\.", "Hello")
[1] FALSE

the . means anything as pointed out by SimonO101, if you want to look for an explicit . then you have to skip it by using \\. which means look for a .

R documentation is extensive on regular expressions, you can also take a look at this link to understand the use of the dot.

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